Table 1.

Maximum-likelihood estimates of strategies used in articles and patents, 1980–2010

Model parameter	MEDLINE articles*	US patents*
Preference for degree of the more central chemical, ${\alpha }_{\mu }$	1.375 (1.374, 1.377)	1.508 (1.505, 1.512)
Preference for degree of the less central chemical, ${\alpha }_{\iota }$	−0.280 (−0.281, −0.280)	−0.172 (−0.175, −0.169)
Preference for network distance between chemicals, β	−5.312 (−5.328, −5.297)	−5.503 (−5.536, −5.469)
Preference for network distance between chemicals, γ	−45.369 (−45.470, −45.268)	−49.579 (−49.799, −49.345)
Preference for bridging disconnected network components, δ	−15.483 (−15.529, −15.428)	−16.303 (−16.399, −16.200)

^*Modal estimates; 99% credible intervals in parentheses.